| Studies on the crystallization behaviour of Si02 52.0, Al20 3 22.0, RO
(CaO + MgO) lo.5, R20 (Na20 + K20) 13.5, Ti02 6.0 (wt %)
glass were carried out. The glass possessed fair working characteristia
and corrosion of the melting pot was insignificant. The glass did not
show any tendency towards deformation during crystallization. On
crystallization, glass-ceramics possessing high mechanical strength
(50,000 psi) and fair resistance to attack of alkali were obtained.
The DTA curve exhibited exothermic peaks at 720° and 835°C. The
principal crystal phases appearing at 760°, 835° and 930°C were
identified as nepheline and sphene, while cordierite was also detected. |
